Docker packages applications into containers that run consistently across machines, solving the classic problem of code working on one computer but not another.

Kubernetes orchestrates many containers across multiple servers, handling scaling, load balancing, self-healing, and rolling updates.

For most beginners and small projects, Docker alone, often with Docker Compose, is sufficient and far simpler to learn and operate.

Kubernetes becomes valuable when you run many services, need automatic scaling, or must maintain high availability across servers.

Learn Docker first, since Kubernetes builds on container concepts, and add Kubernetes only when a real scaling or reliability need appears.